TO THOSE USING a VPN:
The client application must use the VPN concentrator address 194.177.125.26 (Production) and 62.48.50.113 (Test and DR).

VPN session must use the following UDP ports:

– UDP 500
– Protocol ESP Bidirectional
– UDP4500

The client to lan VPN for e-MID connection is an IPSEC-based VPN using UDP ports, so it is not possible to use for this VPN normal HTTP proxy/cache (i.e. SQUID, Apache, etc).
If the proxy, on the contrary, acts also as router/firewall (i.e. ISA), and let UDP ports 500,4500 pass to the internet, then it is possible to use such a proxy.